• Proceedings of the Korea Information Processing Society Conference
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• 2011.04a
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• pp.979-981
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• 2011

In this paper, a new scheme to improve both the capacity and distortion performance for error-prediction method is proposed. For every triangle mesh, two vertices were selected to predict the rest vertex, and the prediction error distances which were vertical and paralleled to the edge between these two vertices would be used to embed two units of secret date amount. We sort the meshes before embedding according to predicted error in order to decrease the distortion. Experiment results show that our approach increase the capacity and decrease the distortion as compared to the original algorithm.

• Journal of the Korea Computer Graphics Society
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• v.9 no.2
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• pp.1-9
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• 2003

Information assurance(IA) refers to methodologies to protect engineering information by ensuring its availability, confidentiality, integrity, non-repudiation, authentication, access control, etc. In collaborative design, IA techniques are needed to protect intellectual property, establish security privileges and create "need to know" protections on critical features. Aside from 3D watermarking, research on how to provide IA to distributed collaborative engineering teams is largely non-existent. This paper provides a framework for information assurance within collaborative design, based on a technique we call role-based viewing. Such role-based viewing is achieved through integration of multi-resolution geometry and security models. 3D models are geometrically partitioned, and the partitioning is used to create multi-resolution mesh hierarchies. Extracting an appropriately simplified model suitable for access rights for individual designers within a collaborative design environment is driven by an elaborate access control mechanism.

• Proceedings of the Korea Information Processing Society Conference
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• 2009.11a
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• pp.355-356
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• 2009

점자 체계와 CMYK 모델을 이용하여 시각 장애인과 일반인이 읽을 수 있는 책을 만들기 위한 방법론을 제시한다. CMYK의 K를 이용해 8개의 점으로 구성된 셀 문자를 텍스트에 삽입하여, 텍스트 스캔 시 빠르고 정확한 문자 인식이 가능하게 한다.

• Proceedings of the Korea Information Processing Society Conference
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• 2004.11a
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• pp.875-878
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• 2004

본 논문은 3차원 메쉬 모델의 정점간 거리 및 DCT를 이용한 3차원 메쉬 모델 워터마킹 방법을 제안한다. 제안한 방법은 3차원 메쉬 모델의 임의의 정점간 거리를 이용하여 워터마킹하게 되며 삽입 시 임의의 정점간 거리집합을 DCT 변환 하여 그 계수 값에 워터마크가 삽입된다. 그러므로 정점간의 거리를 DCT변환하여 삽입함으로써 비지각성 및 여러 공격에 강인하다. 또한 워터마크 크기만큼의 여러 거리집합을 생성하여 사용함으로 지역패치 및 지역분할 개념으로써 부분적인 공격에 강인하며 3차원 메쉬 모델의 페이스모양에 상관없이 워터마크를 삽입 할 수 있다.